This is the incredibly daring moment a cyclist rode his bike at 50mph directly behind a bus in a bid to use its slipstream to pick up speed.

Two motorists filmed the bold move as the cyclist took part in the dangerous and 'incredibly stupid' pursuit along a busy road at rush-hour in Barcelona, Spain.

Dramatic video footage shows the cyclist pedalling extremely close to the back of the bus, in a bid to capitalise on the ‘slipstream’, as fellow drivers gasp in horror.

Two motorists filmed the bold move as the cyclist took part in the dangerous and 'incredibly stupid' pursuit at 50mph along the the Ronda del Litoral in Barcelona, Spain. Pictured: The cyclist travels directly behind the bus

The cyclist travelled just inches behind the bus in a bid to capitalise on its 'slipstream' in a bid to conserve energy and gain speed. It occurred on the busy Ronda del Litoral in Barcelona, Spain, at rush-hour last Friday

At one point, the camera pans to the speedometer of the car in which the passenger is filming and shows it creeping up towards 80kph (50mph).

‘Drafting the slipstream’, or using the backdraft from a vehicle to gain speed, is a tactic used by some cyclists who try to increase their speed while minimising the amount of effort they have to use.

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It is a technique, often seen in professional cycling, to reduce wind resistance and drag which in turn helps reduce energy expenditure.

Although the man was wearing a high-visibility jacket and a helmet, Spanish law dictates that it is illegal to cycle along the B-10 - also known as the Ronda del Litoral – which he was travelling along.

Sources from Barcelona City Hall told The Local that the cyclist has not yet been identified because police patrols in the tunnel had failed to spot him last Friday.

Although the man was wearing a high-visibility jacket and a helmet, Spanish law dictates that it is illegal to cycle along the B-10 - also known as the Ronda del Litoral – which he was travelling along in Barcelona (above)

At one point, the camera pans to the speedometer of the car in which the passenger is filming and shows it creeping up towards 80kph (50mph). Internet users slammed the cyclist for the 'incredibly stupid' pursuit

The sources also claimed the speed cameras on the B-10 did not flash him because he was not going over the maximum speed limit for that particular stretch of road.

The video, which was uploaded to YouTube, has received a range of comments from outraged internet users who have slammed the cyclist for his 'incredibly stupid' behaviour.

Others suggested he was 'playing with his life', pointing out that he is likely to have found himself injured had the bus needed to have braked or stopped suddenly.